Patents by Inventor Hirohisa Kawasaki
Hirohisa Kawasaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9281474Abstract: A variable resistance memory according to an embodiment includes: a first wiring; a second wiring provided above the first wiring and intersecting with the first wiring; a third wiring provided above the second wiring and intersecting with the second wiring; a first variable resistance element provided in an intersection region between the first wiring and the second wiring, the first variable resistance element including a first variable resistance layer formed on the first wiring, and an ion source electrode provided on the first variable resistance layer and penetrating through the second wiring, the ion source electrode being connected to the second wiring and including metal atoms; and a second variable resistance element provided in an intersection region between the second wiring and the third wiring, the second variable resistance element including a second variable resistance layer formed on the ion source electrode.Type: GrantFiled: July 26, 2013Date of Patent: March 8, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventor: Hirohisa Kawasaki
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Patent number: 8969846Abstract: A variable resistance memory according to the present embodiment includes a memory cell including an ion source electrode including metal atoms, an opposite electrode, an amorphous silicon film formed between the ion source electrode and the opposite electrode, and a polysilicon film formed between the amorphous silicon film and the ion source electrode.Type: GrantFiled: July 14, 2014Date of Patent: March 3, 2015Assignee: Kabushiki Kaisha ToshibaInventor: Hirohisa Kawasaki
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Publication number: 20150008388Abstract: A variable resistance memory according to the present embodiment includes a memory cell including an ion source electrode including metal atoms, an opposite electrode, an amorphous silicon film formed between the ion source electrode and the opposite electrode, and a polysilicon film formed between the amorphous silicon film and the ion source electrode.Type: ApplicationFiled: July 14, 2014Publication date: January 8, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Hirohisa KAWASAKI
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Patent number: 8859389Abstract: Methods of making fins and semiconductor structures containing fins are provided. The methods involve forming a multi-layer structure over a semiconductor substrate. The multi-layer structure comprises a first layer over the semiconductor substrate, a second layer over the first layer, and a third layer over the second layer. The method also comprises removing upper portions of the semiconductor substrate and portions of the multi-layer structure to form fins of the semiconductor substrate and portions of the multi-layer structure. Further, the method comprises selectively oxidizing the first layer while oxidization of the second layer and the third layer is less than the oxidization of the first layer. The oxidation can be performed before gap fill recess or after gap fill recess.Type: GrantFiled: January 28, 2011Date of Patent: October 14, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Hirohisa Kawasaki, Basker Veeraraghavan, Hemant Adhikari, Witold Maszara
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Patent number: 8809830Abstract: A variable resistance memory according to the present embodiment includes a memory cell including an ion source electrode including metal atoms, an opposite electrode, an amorphous silicon film formed between the ion source electrode and the opposite electrode, and a polysilicon film formed between the amorphous silicon film and the ion source electrode.Type: GrantFiled: March 21, 2012Date of Patent: August 19, 2014Assignee: Kabushiki Kaisha ToshibaInventor: Hirohisa Kawasaki
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Publication number: 20130313508Abstract: A variable resistance memory according to an embodiment includes: a first wiring; a second wiring provided above the first wiring and intersecting with the first wiring; a third wiring provided above the second wiring and intersecting with the second wiring; a first variable resistance element provided in an intersection region between the first wiring and the second wiring, the first variable resistance element including a first variable resistance layer formed on the first wiring, and an ion source electrode provided on the first variable resistance layer and penetrating through the second wiring, the ion source electrode being connected to the second wiring and including a metal atoms; and a second variable resistance element provided in an intersection region between the second wiring and the third wiring, the second variable resistance element including a second variable resistance layer formed on the ion source electrode.Type: ApplicationFiled: July 26, 2013Publication date: November 28, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Hirohisa KAWASAKI
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Publication number: 20130075686Abstract: A variable resistance memory according to the present embodiment includes a memory cell including an ion source electrode including metal atoms, an opposite electrode, an amorphous silicon film formed between the ion source electrode and the opposite electrode, and a polysilicon film formed between the amorphous silicon film and the ion source electrode.Type: ApplicationFiled: March 21, 2012Publication date: March 28, 2013Applicant: Kabushiki Kaisha ToshibaInventor: Hirohisa Kawasaki
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Patent number: 8362574Abstract: FinFETs and methods of making FinFETs are provided. The FinFET contains two or more fins over a semiconductor substrate; two or more epitaxial layers over side surfaces of the fins; and metal-semiconductor compounds over an upper surfaces of the epitaxial layers. The fin has side surfaces that are substantially vertical relative to the upper surface of the semiconductor substrate. The epitaxial layer has an upper surface that extends at an oblique angle with respect to the side surface of the fin. The FinFET can contain a contact over the metal-semiconductor compounds.Type: GrantFiled: June 4, 2010Date of Patent: January 29, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Hirohisa Kawasaki, Chung-hsun Lin
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Publication number: 20120193751Abstract: Methods of making fins and semiconductor structures containing fins are provided. The methods involve forming a multi-layer structure over a semiconductor substrate. The multi-layer structure comprises a first layer over the semiconductor substrate, a second layer over the first layer, and a third layer over the second layer. The method also comprises removing upper portions of the semiconductor substrate and portions of the multi-layer structure to form fins of the semiconductor substrate and portions of the multi-layer structure. Further, the method comprises selectively oxidizing the first layer while oxidization of the second layer and the third layer is less than the oxidization of the first layer. The oxidation can be performed before gap fill recess or after gap fill recess.Type: ApplicationFiled: January 28, 2011Publication date: August 2, 2012Applicants: TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC., INTERNATIONAL BUSINESS MACHINES CORPORATION, GLOBALFOUNDRIES INC.Inventors: Hirohisa Kawasaki, Basker Veeraraghavan, Hemant Adhikari, Witold Maszara
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Publication number: 20120108016Abstract: Static random access memory cells and methods of making static random access memory cells are provided. The static random access memory cells contain two non-planar pass-gate transistors, two non-planar pull-up transistors, two non-planar pull-down transistors. A portion of a fin of the non-planar pull-up transistor is electrically connected to a portion of a fin of the non-planar pull-down transistor by an assist-bar. The methods involve forming an assist-fin between fins of a non-planar pull-up transistor and a non-planar pull-down transistor and between gate electrodes, and widening a width of the assist-fin to form the assist-bar so that a portion of the fin of non-planar pull-up transistor is electrically connected to a portion of the fin of non-planar pull-down transistor via the assist-bar.Type: ApplicationFiled: January 6, 2012Publication date: May 3, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Hirohisa Kawasaki
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Patent number: 8134209Abstract: Multi-gate metal oxide silicon transistors and methods of making multi-gate metal oxide silicon transistors are provided. The multi-gate metal oxide silicon transistor contains a bulk silicon substrate containing one or more convex portions between shallow trench regions; one or more dielectric portions over the convex portions; one or more silicon fins over the dielectric portions; a shallow trench isolation layer in the shallow trench isolation regions; and a gate electrode. The upper surface of the shallow trench isolation layer can be located below the upper surface of the convex portion, or the upper surface of the shallow trench isolation layer can be located between the lower surface and the upper surface of first dielectric layer. The multi-gate metal oxide silicon transistor can contain second spacers adjacent to side surfaces of the convex portions in a source/drain region.Type: GrantFiled: December 17, 2009Date of Patent: March 13, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Atsushi Yagishita, Makoto Fujiwara, Hirohisa Kawasaki, Mariko Takayanagi
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Patent number: 8116121Abstract: Static random access memory cells and methods of making static random access memory cells are provided. The static random access memory cells contain two non-planar pass-gate transistors, two non-planar pull-up transistors, two non-planar pull-down transistors. A portion of a fin of the non-planar pull-up transistor is electrically connected to a portion of a fin of the non-planar pull-down transistor by an assist-bar. The methods involve forming an assist-fin between fins of a non-planar pull-up transistor and a non-planar pull-down transistor and between gate electrodes, and widening a width of the assist-fin to form the assist-bar so that a portion of the fin of non-planar pull-up transistor is electrically connected to a portion of the fin of non-planar pull-down transistor via the assist-bar.Type: GrantFiled: March 6, 2009Date of Patent: February 14, 2012Assignee: Kabushiki Kaisha ToshibaInventor: Hirohisa Kawasaki
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Publication number: 20110298058Abstract: FinFETs and methods of making. FinFETs are provided. The FinFET contains two or more fins over a semiconductor substrate; two or more epitaxial layers over side surfaces of the fins; and metal-semiconductor compounds over an upper surfaces of the epitaxial layers. The fin has side surfaces that are substantially vertical relative to the upper surface of the semiconductor substrate. The epitaxial layer has an upper surface that extends at an oblique angle with respect to the side surface of the fin. The FinFET can contain a contact over the metal-semiconductor compounds.Type: ApplicationFiled: June 4, 2010Publication date: December 8, 2011Applicant: TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.Inventors: Hirohisa Kawasaki, Chung-hsun Lin
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Publication number: 20110260282Abstract: Methods of making fins and semiconductor structures containing fins are provided. The methods involve forming a multi-layer structure over fins and isolation materials and performing a multi-stage etching process to remove upper portions of the multi-layer structure and upper portions of isolation materials. Upper portions of the fins are exposed by removing the upper portions of the isolation materials via the multi-stage etching process. A stage of the multi-stage etching process removes an upper layer of the multi-layer structure and an upper portion of the isolation materials, and the stage can be terminated about at the same time when the upper surface of the underlying layer of the multi-layer structure is exposed.Type: ApplicationFiled: April 23, 2010Publication date: October 27, 2011Applicant: TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.Inventor: Hirohisa Kawasaki
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Publication number: 20110147839Abstract: Multi-gate metal oxide silicon transistors and methods of making multi-gate metal oxide silicon transistors are provided. The multi-gate metal oxide silicon transistor contains a bulk silicon substrate containing one or more convex portions between shallow trench regions; one or more dielectric portions over the convex portions; one or more silicon fins over the dielectric portions; a shallow trench isolation layer in the shallow trench isolation regions; and a gate electrode. The upper surface of the shallow trench isolation layer can be located below the upper surface of the convex portion, or the upper surface of the shallow trench isolation layer can be located between the lower surface and the upper surface of first dielectric layer. The multi-gate metal oxide silicon transistor can contain second spacers adjacent to side surfaces of the convex portions in a source/drain region.Type: ApplicationFiled: December 17, 2009Publication date: June 23, 2011Applicant: TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.Inventors: Atsushi Yagishita, Makoto Fujiwara, Hirohisa Kawasaki, Mariko Takayanagi
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Patent number: 7816739Abstract: A semiconductor device includes a first semiconductor layer, an n-type/p-type second semiconductor layer, p-type/n-type third semiconductor layers and a first gate electrode. The second semiconductor layer is formed on the first semiconductor layer and has an oxidation rate which is lower than that of the first semiconductor layer. The third semiconductor layers are formed in the second semiconductor layer and have a depth reaching an inner part of the first semiconductor layer. In case that the second and third semiconductor layers are n-type and p-type, respectively, a lattice constant of the second semiconductor layer is less than that of the third semiconductor layer. In case that the second and third semiconductor layers are p-type and n-type, respectively, the lattice constant of the second semiconductor layer is greater than that of the third semiconductor layer. A first gate electrode is formed on the second semiconductor layer.Type: GrantFiled: January 4, 2007Date of Patent: October 19, 2010Assignee: Kabushiki Kaisha ToshibaInventor: Hirohisa Kawasaki
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Publication number: 20100224943Abstract: Static random access memory cells and methods of making static random access memory cells are provided. The static random access memory cells contain two non-planar pass-gate transistors, two non-planar pull-up transistors, two non-planar pull-down transistors. A portion of a fin of the non-planar pull-up transistor is electrically connected to a portion of a fin of the non-planar pull-down transistor by an assist-bar. The methods involve forming an assist-fin between fins of a non-planar pull-up transistor and a non-planar pull-down transistor and between gate electrodes, and widening a width of the assist-fin to form the assist-bar so that a portion of the fin of non-planar pull-up transistor is electrically connected to a portion of the fin of non-planar pull-down transistor via the assist-bar.Type: ApplicationFiled: March 6, 2009Publication date: September 9, 2010Applicant: TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.Inventor: Hirohisa Kawasaki
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Patent number: 7687368Abstract: A semiconductor device manufacturing method is disclosed. The method is to form a second semiconductor layer which has less susceptibility to adopting insulative characteristics than a first semiconductor layer on the first semiconductor layer. Then, grooves which expose portions of the second and first semiconductor layers are formed to extend from the upper surface of the second semiconductor layer into the first semiconductor layer. Next, portions of the first and second semiconductor layers which are exposed to the grooves are changed into an insulator form to fill the grooves with the insulator-form portions of the first semiconductor layer.Type: GrantFiled: March 25, 2005Date of Patent: March 30, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Hirohisa Kawasaki, Kazunari Ishimaru, Kunihiro Kasai, Yasunori Okayama
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Publication number: 20090174036Abstract: A methodology is disclosed that enables the fabrication of semiconductor devices (i.e., STI structures, gates, and interconnects) with significantly reduced line edge roughness (LER) and line width roughness (LEW) post lithography patterning. The inventive methodology entails the use of an inert species containing plasma tuned to enhanced its' vacuum ultra violet (VUV) emissions post lithography and/or post one of the etch processes of a given feature (on an identical etch platform) to entice increased crosslinking of one or more patterning materials, thus enabling increased etch resistance and reduced LER and LEW post etching processing.Type: ApplicationFiled: January 4, 2008Publication date: July 9, 2009Applicants: INTERNATIONAL BUSINESS MACHINES CORPORATION, TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.Inventors: Nicholas C. Fuller, Michael A. Guillorn, Hirohisa Kawasaki, Atsushi Yagishita
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Patent number: 7541245Abstract: A semiconductor device includes a semiconductor substrate, an insulating film projected on a surface of the semiconductor substrate, a semiconductor film provided on a side surface of the insulating film, and MIS transistor formed in the semiconductor film, the MIS transistor having source, gate and drain region. The semiconductor device further includes a gate electrode provided on the gate region of the MIS transistor, the length of the gate electrode being larger than the thickness of the semiconductor film.Type: GrantFiled: December 12, 2006Date of Patent: June 2, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Hirohisa Kawasaki, Kazunari Ishimaru